Worst Service Recieved

I bought an Omaga tablet through Fonechoice in November as a birthday gift for my son, that have not been working since the word get go. They fetch it from me for repairs and I received it back in the same state in was given to them, STILL NOT WORKING. They then took 3 months to collect the tablet from me again after numerous phone call to them with no proper answer. Phone them today after 2 months of having not heard from them after tablet was collected just so they can inform me it needs to be replaced but they do not have stock. How come I was not phoned about this when the tablet reached your offices??? I have NEVER in my life been so disappointed with a company.